High‐Brightness, Hundred‐Second Level Ultralong Afterglow Polymers Built via Ultrasound‐Synchronized B‐O‐Click Strategy

Abstract In recent years, there has been a growing interest in pure organic materials with ultralong room temperature phosphorescence (RTP) and afterglow duration time (t_ag) in the range of second level. However, it is extremely difficult to achieve t_ag >60 s in the polymer fields. Herein, this work proposes a highly versatile ultrasound‐synchronized B‐O‐Click strategy that can firmly immobilize various types of polycyclic aromatic boronic acids (PABAs) as single‐molecular states in a tight and rigid matrix of poly(vinyl alcohol) (PVA), achieving a series of record‐breaking ultralong afterglow polymeric RTP materials. Based on this approach, a polymeric material is reported exhibiting a record‐breaking t_ag = 130 s, accompanied with an ultralong lifetime of 7.24 s and a good phosphorescence efficiency of 14.26%. Three other polymeric materials with t_ag over 60 s are also realized via the same strategy by changing the phosphor. In addition, record‐breaking ultralong green (t_ag = 115 s) and red (t_ag = 80 s) afterglow are further achieved based on the phosphorescence resonance energy transfer (PRET) effect.